[GRASS-git] [OSGeo/grass] 7388b3: configure: fix odbc configuration for Windows (#1883)

[nilason]

  Branch: refs/heads/releasebranch_7_8
  Home:   https://github.com/OSGeo/grass
  Commit: 7388b3f2f08fac93c5334ec736f305d42844e317
      https://github.com/OSGeo/grass/commit/7388b3f2f08fac93c5334ec736f305d42844e317
  Author: nilason <n_larsson at yahoo.com>
  Date:   2021-09-21 (Tue, 21 Sep 2021)

  Changed paths:
    M configure
    M configure.ac
    M include/config.h.in

  Log Message:
  -----------
  configure: fix odbc configuration for Windows (#1883)

Following update to autoconf 2.69 and its changed AC_CHECK_HEADER workings,
configuring with ODBC for Windows fails if not "windows.h" is included.

See:
https://www.gnu.org/savannah-checkouts/gnu/autoconf/manual/autoconf-2.69/autoconf.html#Present-But-Cannot-Be-Compiled